"All are presented so skilfully that one can imagine that Professor Mach's hearers departed from his lecture-room with the conviction that science was a matter for abecedarians. Will please those who find the fairy tales of science more absorbing than fiction."--_The Pilot_, Boston. "Professor Mach ... is a master in physics.... His book is a good one and will serve a good purpose, both for instruction and suggestion."--Prof. A. E. Dolbear, in _The Dial_. "The most beautiful ideas are unfolded in the exposition."--_Catholic World_, New York. THE ANALYSIS OF THE SENSATIONS By DR. ERNST MACH. PROFESSOR OF THE HISTORY AND THEORY OF INDUCTIVE SCIENCE IN THE UNIVERSITY OF VIENNA. Pages, 208. Illustrations, 37. Indexed. (Price, Cloth, $1.25.) CONTENTS. Introductory: Antimetaphysical. The Chief Points of View for the Investigation of the Senses. The Space-Sensations of the Eye. Space-Sensation, Continued. The Relations of the Sight-Sensations to One Another and to the Other Psychical Elements. The Sensation of Time. The Sensation of Sound. Influence of the Preceding Investigations on the Mode of Conceiving Physics. "A wonderfully original little book. Like everything he writes a work of genius."--_Prof. W. James_ of Harvard. "I consider each work of Professor Mach a distinct acquisition to a library of science."--_Prof. D. W. Hering_, New York University. "There is no work known to the writer which, in its general scientific bearings, is more likely to repay richly thorough study. We are all interested in nature in one way or another, and our interests can only be heightened and clarified by Mach's wonderfully original and wholesome book. It is not saying too much to maintain that every intelligent person should have a copy of it,--and should study that copy."--_Prof. J. E. Trevor_, Cornell. "Students may here make the acquaintance of some of the open questions of sensation and at the same time take a lesson in the charm of scientific modesty that can hardly be excelled."--_Prof. E. C. Sanford_, Clark University. "It exhibits keen observation and acute thought, with many new and interesting experiments by way of illustration. Moreover, the style is light and even lively--a rare merit in a German prose work, and still rarer in a translation of one."--_The Literary World_, London. CHICAGO: The Open Court Publishing Company 324 DEARBORN STREET. LONDON: Kegan Paul, Trench, Trübner, & Company. CATALOGUE OF PUBLICATIONS OF THE OPEN COURT PUBLISHING CO. COPE, E. D. THE PRIMARY FACTORS OF ORGANIC EVOLUTION. 121 cuts. Pp., xvi, 547. Cloth, $2.00, net. MÜLLER, F. MAX. THREE INTRODUCTORY LECTURES ON THE SCIENCE OF THOUGHT. With a correspondence on "Thought Without Words," between F. Max Müller and Francis Galton, the Duke of Argyll, George J. Romanes and others. 128 pages. Cloth, 75 cents. Paper, 25 cents.